Combustor and gas turbine
View Patent ↗A combustor including a transition piece that defines a flow channel therein; a combustor basket inserted in the transition piece from an upstream side of the flow channel that sends a combustion gas through the flow channel and defines a gap through which a compressed air is sent with an inner peripheral surface of the transition piece; wherein the combustor basket includes a notch portion recessed from an end of the combustor basket on a downstream side toward the upstream side, and a purge air introduction hole through which the compressed air in the gap is introduced into the notch portion.
1. A combustor comprising:
a transition piece that defines a flow channel therein;
a combustor basket inserted in the transition piece from an upstream side of the flow channel that sends a combustion gas through the flow channel and defines a gap through which a compressed air is sent between an inner peripheral surface of the transition piece and the combustor basket; wherein
the combustor basket includes
a notch portion recessed from an end of the combustor basket on a downstream side toward the upstream side and having a shape that corresponds to a connecting pipe that opens along the inner peripheral surface of the transition piece, and
a purge air introduction hole through which the compressed air in the gap is directly introduced into the notch portion,
wherein the purge air introduction hole includes a plurality of first through-holes, and
wherein the plurality of first through-holes are provided along an axial direction of the combustor.
2. The combustor according to claim 1 , wherein
the combustor basket includes a protruding portion formed along an edge of the notch portion that protrudes in a direction away from the flow channel, and the plurality of first through-holes pass through the protruding portion.
3. The combustor according to claim 2 , wherein each of the plurality of first through-holes decreases in inner diameter dimension from the upstream side toward the downstream side.
4. The combustor according to claim 2 , wherein each of the plurality of first through-holes increases in inner diameter dimension from the upstream side toward the downstream side.
5. A gas turbine comprising:
a plurality of the combustors according to claim 1 , wherein the plurality of combustors are connected to each other via the connecting pipe.
6. The combustor according to claim 1 , wherein the plurality of first through-holes extend toward the notch portion.
7. The combustor according to claim 1 , wherein the purge air introduction hole further comprises a plurality of second through-holes which are formed in a direction intersecting the axial direction of the combustor.
8. The combustor according to claim 7 , wherein the notch portion includes an arcuate portion with an arcuate shape, and linear portions with a rectilinear shape that extend from the arcuate portion towards a downstream edge of the combustor basket,
the plurality of first through-holes, which are formed along the axial direction of the combustor, are formed in the arcuate portion, and
the plurality of second through-holes, which are formed in the direction intersecting the axial direction, are formed in the linear portions.